Seiko 5 DX 5139-7020 from 1978 – a refined member of the upgraded “DX” line, positioned above the standard Seiko 5 series in both finishing and movement specification. The DX series was created for a more elegant, urban audience, blending the practicality of the “5” concept with higher jewel counts and enhanced dial execution. This reference showcases that philosophy with its sharp case profile, silver sunburst dial, and long faceted baton indices. The applied DX emblem adds depth to the dial, and the subtle metallic texture reflects the design language of Seiko's early 1970s dress-sport era. Powered by the 5139 automatic movement, the watch features: Crown-push quick-set date English-only day display 27-jewel construction The case measures 37.1 mm, offering a modern wrist presence while preserving vintage proportions. A new leather strap is fitted for immediate wear. Running at the time of listing. As a vintage watch, stable operation, accuracy, and water resistance are not guaranteed. The watch will be carefully packed and shipped with tracking for safe delivery.